Chapter 5 – General Operation
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13841 Rev A
159
equipped with a balance wheel or balance points
equidistant from the center of rotation.
5.5.5 Tail Rotor Track
Even though many helicopters have fixed pitch change links
(PCLs) for the tail rotor, this feature does not mean track is never
a problem. On such aircraft, track differences can cause
difficulty in balancing to low levels or may result in high IPS
levels during forward flight.
Track the tail rotor by using the Strobex. In general, do this
operation, as follows:
1. Install the photocell system so one of the blade tips points
towards the cabin. Make sure the retro-reflective target that
triggers the photocell probe is in line with the probe beam.
2. Apply a thin retro-reflective target along the chord line on
one blade tip and across the chord line on the other blade tip.
If the user is tracking more than two blades, apply a retro-
reflective target to each blade so the targets’ alignments are
distinctly different. For an illustration, see the diagram below.
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